Samuel Yates began, and this site continues, a database of the largest known primes. Primes in that database are assigned a proof-code to show who should be credited with the discovery as well as what programs and projects they used. (Discoverers have one prover-entry, but may have many proof-codes because they use a variety of programs...)
This page provides data on p21, one of those codes.
Code name (*): p21 Persons (*): 2 (counting humans only) Projects (*): 0 (counting projects only) Display (HTML): Anderson, Robinson, OpenPFGW Number of primes: total 63 Unverified Primes: 0 (prime table entries marked 'Composite','Untested', or 'InProcess' Score for Primes (*): total 40.6870, on current list 38.1369 Entrance Rank (*): mean 62.00 (minimum 62, maximum 62)
Below is additional information about this entry.
Display (text): Anderson, Robinson, OpenPFGW Display (short): Anderson & Robinson Database id: 15 (do not use this database id, it is subject to change) Proof program: PrimeForm The primes from this code accounts for 0.217% of the (active) primes and 0.000% of the (active) score for this program. Entry last modified: 2021-08-04 10:37:59